330C Excavator Hydraulic System Caterpillar

Illustration 1	g00668985
Pump regulator (right pump) (1) Bolt (2) Cover (3) Seal (4) Spring seat (5) Spring (6) Shim

Perform the following steps in order to adjust the right pump.

1. Remove two bolts (1) .

2. Remove cover (2) and seal (3) .

3. Remove spring seat (4) and spring (5) .

4. Add shims (6) in order to increase the negative flow. Remove shims (6) in order to decrease the negative flow. Refer to Table 1 for available shims and shim thickness.

   Note: A change of 0.1 mm (0.0039 inch) in shim thickness will change the negative flow rate 4 L/min (1.1 US gpm) at a negative flow control pressure of 2550 kPa (370 psi).

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   Table 1

   Available Shims
   Part Number	Shim Thickness
   099-3669 Shim	1.00 mm (0.0394 inch)
   099-6109 Shim	1.05 mm (0.0413 inch)
   099-6110 Shim	1.10 mm (0.0433 inch)
   099-6111 Shim	1.15 mm (0.0453 inch)
   099-6112 Shim	1.20 mm (0.0472 inch)
   099-6113 Shim	1.25 mm (0.0492 inch)
   099-6115 Shim	1.30 mm (0.0512 inch)
   099-6117 Shim	1.35 mm (0.0531 inch)
   099-6118 Shim	1.40 mm (0.0551 inch)
   099-6119 Shim	1.45 mm (0.0571 inch)
   099-6120 Shim	1.50 mm (0.0591 inch)
   099-6121 Shim	1.55 mm (0.0610 inch)
   099-6122 Shim	1.60 mm (0.0630 inch)
   099-6123 Shim	1.65 mm (0.0650 inch)
   099-6124 Shim	1.70 mm (0.0669 inch)
   099-6125 Shim	1.75 mm (0.0689 inch)
   099-6126 Shim	1.80 mm (0.0709 inch)
   099-6127 Shim	1.85 mm (0.0728 inch)
   099-6128 Shim	1.90 mm (0.0748 inch)
   099-3670 Shim	1.95 mm (0.0768 inch)

5. Install shims (6) in the pump regulator.

6. Install spring (5). Install spring seat (4) .

7. Install cover (2) and seal (3) .

   Note: Inspect seal (3). If the seal is damaged, replace the damaged seal with a new seal.

8. Install bolts (1). Tighten bolts (1) to a torque of 55 ± 10 N·m (40 ± 7 lb ft).

Adjust the left pump in the same manner as the right pump.